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← ScienceWhich risk increases when a turbine blade's gamma prime (γ') precipitates coarsen in the nickel-based superalloy lattice?
A)Reduced high-temperature creep resistance✓
B)Increased susceptibility to oxidation
C)Elevated thermal conductivity threshold
D)Enhanced fatigue delamination tolerance
💡 Explanation
Reduced creep resistance occurs because γ' precipitate coarsening decreases dislocation pinning, driving creep via grain boundary sliding rather than plastic deformation of precipitates. Therefore, creep resistance lowers; rather than increased oxidation because precipitate coarsening primarily affects mechanical properties.
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